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• W2050781353 abstract "Activation of cAMP-dependent protein kinase (PKA) triggers terminal differentiation in Dictyostelium, without an obvious requirement for the G-protein-coupled adenylyl cyclase, ACA, or the osmosensory adenylyl cyclase, ACG. A third adenylyl cyclase, ACB, was recently detected in rapidly developing mutants. The specific characteristics of ACA, ACG, and ACB were used to determine their respective activities during development of wild-type cells. ACA was highly active during aggregation, with negligible activity in the slug stage. ACG activity was not present at significant levels until mature spores had formed. ACB activity increased strongly after slugs had formed with optimal activity at early fruiting body formation. The same high activity was observed in slugs of ACG null mutants and ACA null mutants that overexpress PKA (acaA/PKA), indicating that it was not due to either ACA or ACG. The detection of high adenylyl cyclase activity in acaA/PKA null mutants contradicts earlier conclusions (B. Wang and A. Kuspa, Science 277, 251–254, 1997) that these mutants can develop into fruiting bodies in the complete absence of cAMP. In contrast to slugs of null mutants for the intracellular cAMP-phosphodiesterase REGA, where both intact cells and lysates show ACB activity, wild-type slugs only show activity in lysates. This indicates that cAMP accumulation by ACB in living cells is controlled by REGA. Both REGA inhibition and PKA overexpression cause precocious terminal differentiation. The developmental regulation of ACB and its relationship to REGA suggest that ACB activates PKA and induces terminal differentiation." @default.
• W2050781353 created "2016-06-24" @default.
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• W2050781353 date "1999-08-01" @default.
• W2050781353 modified "2023-10-16" @default.
• W2050781353 title "Fingerprinting of Adenylyl Cyclase Activities during Dictyostelium Development Indicates a Dominant Role for Adenylyl Cyclase B in Terminal Differentiation" @default.
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• W2050781353 doi "https://doi.org/10.1006/dbio.1999.9352" @default.
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